.middle > div {
    width: 900px;
    margin: 50px 0;
    border: 1px solid gray;
}

.middle .company > div {
    text-indent: 3em;
    line-height: 30px;
    margin-bottom: 30px;
    font-family: 新宋体;
}

.product > div {
    margin: 10px;
}

.product img {
    width: 150px;
    height: 120px;
}

.middle > div > div:nth-child(2) > div:nth-child(2) {
    overflow: hidden;
}

.product {
    animation: move 5s linear infinite;
}

@keyframes move {
    0% {
        margin-left: 0;
    }
    25% {
        margin-left: -200px;
    }
    50% {
        margin-left: -400px;
    }
    75% {
        margin-left: -200px;
    }
    100% {
        margin-left: 0;
    }

}
